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Exploring Computer Networks: Communication, Collaboration, and Connectivity

Discover the world of computer communications, collaboration, and connectivity through wireless messaging, Internet access points, GPS systems, and more. Understand network architectures, topologies, and communication standards driving modern connectivity.

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Exploring Computer Networks: Communication, Collaboration, and Connectivity

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  1. Chapter Nine Networks and Communication

  2. Objectives Overview Discovering Computers : Chapter 9 See Page 459 for Detailed Objectives

  3. Objectives Overview Discovering Computers : Chapter 9 See Page 459 for Detailed Objectives

  4. Communications • Computer communications describes a process in which two or more computers or devices transfer data, instructions, and information Discovering Computers : Chapter 9 Page 460

  5. Communications Discovering Computers : Chapter 9 Pages 460 – 461 Figure 9-1

  6. Uses of Computer Communications Discovering Computers : Chapter 9 Page 462

  7. Uses of Computer Communications • Users can send and receive wireless messages using wireless messaging services Discovering Computers : Chapter 9 Pages 462 – 463 Figure 9-3

  8. Uses of Computer Communications Discovering Computers : Chapter 9 Pages 463 - 464

  9. Uses of Computer Communications • Wireless Internet access pointsallow people to connect wirelessly to the Internet from home, work, school, and in many public locations Discovering Computers : Chapter 9 Pages 464 – 465 Figure 9-4

  10. Uses of Computer Communications • A cybercaféis a coffeehouse, restaurant, or other location that provides personal computers with Internet access to its customers Discovering Computers : Chapter 9 Page 466 Figure 9-5

  11. Uses of Computer Communications • A global positioning system(GPS) is a navigation system that consists of one or more earth-based receivers that accept and analyze signals sent by satellites in order to determine the GPS receiver’s geographic location • GPS receivers are: Discovering Computers : Chapter 9 Page 466

  12. Uses of Computer Communications Discovering Computers : Chapter 9 Page 467 Figure 9-6

  13. Uses of Computer Communications Discovering Computers : Chapter 9 Page 467

  14. Uses of Computer Communications • Many programs provide a means to collaborate, or work online, with other users connected to a server • Collaboration software includes tools that enable users to share documents via online meetings and communicate with other connected users Discovering Computers : Chapter 9 Page 468

  15. Uses of Computer Communications Discovering Computers : Chapter 9 Page 468 Figure 9-7

  16. Uses of Computer Communications • Web services enable programmers to create applications that communicate with other remote computers over the Internet or on an internal business network • A mashup is a Web application that combines services from two or more sources Page 469 Figure 9-8 Discovering Computers : Chapter 9

  17. Networks • A network is a collection of computers and devices connected together via communications devices and transmission media • Advantages of a network include: Discovering Computers : Chapter 9 Pages 470 - 471

  18. Networks Discovering Computers : Chapter 9 Page 470 Figure 9-9

  19. Networks • A local area network(LAN) is a network that connects computers and devices in a limited geographical area • A wireless LAN (WLAN) is a LAN that uses no physical wires Page 472 Figures 9-10 – 9-11 Discovering Computers : Chapter 9

  20. Networks • A metropolitan area network (MAN) connects LANs in a metropolitan area • A wide area network (WAN) is a network that covers a large geographical area Discovering Computers : Chapter 9 Page 473 Figure 9-12

  21. Networks • The design of computers, devices, and media on a network is sometimes called the network architecture Client/server network Peer-to-peer network Discovering Computers : Chapter 9 Pages 473 – 474 Figures 9-13 – 9-14

  22. Networks • P2P describes an Internet network on which users access each other’s hard disks and exchange files directly over the Internet Discovering Computers : Chapter 9 Page 475 Figure 9-15

  23. Networks • A network topologyrefers to the layout of the computers and devices in a communications network Star network Bus network Ring network Discovering Computers : Chapter 9 Pages 475 – 477 Figures 9-16 – 9-18

  24. Networks Discovering Computers : Chapter 9 Page 477

  25. Network Communications Standards Discovering Computers : Chapter 9 Page 477

  26. Network Communications Standards Discovering Computers : Chapter 9 Page 478

  27. Network Communications Standards Discovering Computers : Chapter 9 Page 479 Figure 9-19

  28. Network Communications Standards • Wi-Fiidentifies any network based on the 802.11 standard that facilitates wireless communication • Sometimes referred to as wireless Ethernet Page 479 Figure 9-20 Discovering Computers : Chapter 9

  29. Network Communications Standards • Bluetooth defines how two Bluetooth devices use short-range radio waves to transmit data • UWB (ultra-wideband) specifies how two UWB devices use short-range radio waves to communicate at high speeds • IrDA transmits data wirelessly via infrared (IR) light waves • RFIDuses radio signals to communicate with a tag placed in or attached to an object, animal, or person Discovering Computers : Chapter 9 Pages 480 - 481

  30. Network Communications Standards Discovering Computers : Chapter 9 Page 481 Figure 9-21

  31. Network Communications Standards Discovering Computers : Chapter 9 Page 482

  32. Communications Software • Communications softwareconsists of programs that: Discovering Computers : Chapter 9 Page 482

  33. Communications Over the Telephone Network • The public switched telephone network (PSTN) is the worldwide telephone system Discovering Computers : Chapter 9 Pages 482 – 483 Figure 9-23

  34. Communications Over the Telephone Network Discovering Computers : Chapter 9 Pages 483 - 485

  35. Communications Over the Telephone Network Discovering Computers : Chapter 9 Page 483 Figure 9-24

  36. Communications Over the Telephone Network • ADSL connections transmit data downstream at a much faster rate than upstream Discovering Computers : Chapter 9 Page 484 Figure 9-25

  37. Communications Devices • A communications deviceis any type of hardware capable of transmitting data, instructions, and information between a sending device and a receiving device • A dial-up modem converts signals between analog and digital Discovering Computers : Chapter 9 Page 485

  38. Communications Devices • A digital modem sends and receives data and information to and from a digital line Discovering Computers : Chapter 9 Page 486

  39. Communications Devices Page 486 Figures 9-26 – 9-27 Discovering Computers : Chapter 9

  40. Communications Devices • A wireless modemuses the cell phone network to connect to the Internet wirelessly from a notebook computer, a smart phone, or other mobile device Discovering Computers : Chapter 9 Page 487 Figure 9-28

  41. Communications Devices • A network cardenables a computer or device to access a network • Available in a variety of styles • Wireless network cards often have an antenna Page 487 Figure 9-29 Discovering Computers : Chapter 9

  42. Communications Devices • A wireless access point is a central communications device that allows computers and devices to transfer data wirelessly among themselves or to a wired network Discovering Computers : Chapter 9 Page 487 Figure 9-30

  43. Communications Devices • A router connects multiple computers or other routers together and transmits data to its correct destination on a network • Many are protected by a hardware firewall Page 488 Figure 9-31 Discovering Computers : Chapter 9

  44. Communications Devices • A hub or switch connects several devices in a network together Discovering Computers : Chapter 9 Pages 488 – 489 Figure 9-32

  45. Home Networks • Home networks provide computers with the following capabilities: Discovering Computers : Chapter 9 Page 489

  46. Home Networks • Types of wired home networks: Discovering Computers : Chapter 9 Page 489

  47. Home Networks Discovering Computers : Chapter 9 Page 490 Figure 9-33

  48. Communications Channel • The amount of data that can travel over a communications channel sometimes is called the bandwidth • Latency is the time it takes a signal to travel from one location to another on a network • Transmission media carries one or more signals • Broadband media transmit multiple signals simultaneously Page 491 Figure 9-34 Discovering Computers : Chapter 9

  49. Physical Transmission Media Discovering Computers : Chapter 9 Page 492 Figure 9-35

  50. Physical Transmission Media Twisted-pair cable Fiber-optic cable Coaxial cable Discovering Computers : Chapter 9 Page 493 Figures 9-36 – 9-38

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